PCI SCSI Device Management System SDMS 4.0

Symbios Logic PCI SDMS User’s Guide

Table of Contents

Device Drivers for Windows NT

Chapter 8

Device Drivers for Windows

NT

Introduction for Windows NT 3.5x/4.x

Features

Description

Installing Your SYMC8XX.SYS Driver

Preparing a Symbios Driver Diskette

New System Installation

Existing System Installation

Windows NT 4.x

Windows NT 3.5x

Disk Mirroring

Command Line Options

Troubleshooting

8-1

8-2

8-3

8-4

8-4

8-4

8-6

8-6

8-7

8-9

8-11

8-11


Table of Contents

Device Drivers for Windows NT


Device Drivers for Windows NT

8

Introduction for Windows NT 3.5x/4.x

Introduction for Windows NT

3.5x/4.x

8

Windows NT 3.5x/4.x is an operating system designed to run on processors using current technology. It provides a graphical user interface environment incorporating many high-level features (refer to the Microsoft Windows NT

3.5x/4.x documentation for details). I/O requests in

Windows NT 3.5x/4.x are handled by an I/O manager. To address a SCSI peripheral, the I/O manager goes through the appropriate drivers. Class drivers for hard disk, floptical, CD-ROM, printer, and scanner peripherals are provided in Windows NT 3.5x/4.x. Other class drivers, provided by peripheral manufacturers, may be added to support new devices. Tape device support is built into the operating system itself and does not require a class driver.

Symbios Logic/Microsoft provide a miniport driver, called SYMC8XX.SYS, to complete the path to a

Symbios Logic controller or processor with an optional

SDMS SCSI BIOS. The following sections describe this driver and its installation.


8 -1



Figure 8-1

8

SCSI I/O Flow in Windows NT

WINDOWS NT

DISK

CLASS DRIVER

WINDOWS NT

CD_ROM

CLASS DRIVER

WINDOWS NT

OTHER

CLASS DRIVER

WINDOWS NT

PORT DRIVER

SDMS MINIPORT DRIVER

Symbios Logic SCSI Chip

Features

8

●

●

●

●

●

●

●

●

●

●

●

●

●

Synchronous negotiation (including Fast/Ultra SCSI)

Wide negotiation

Tagged command queuing

Supports multiple host adapters

Supports multiple Logical Unit Numbers (LUNs)

Disconnect/Reselect

Scatter-Gather

Differential support

Supports SCSI pass-through functionality

BUS device reset

Scan order change (scans the bus from SCSI ID 0 to

MAX SCSI ID [7 or 15])

Supports disk array configurations with no LUN 0

Supports disk array configurations with noncontiguous LUNs

8-2 Symbios Logic PCI SDMS User’s Guide

Description



●

●

●

●

●

●

Ultra SCSI (Fast 20) support (20 MB/s narrow, 40

MB/s wide)

Target initiated negotiation support

Auto request sense

Renegotiation of wide/sync parameters on request sense commands

Maximum 256K block size support

Full NVRAM support (wide/sync parameters, SCSI

ID)

8

SYMC8XX.SYS is designed to Microsoft's specification for miniport drivers. This driver allows connection of

SCSI devices including disk drives, CD-ROMs, and tape drives for PCI-based machines. To support a new SCSI device the Windows NT 3.5x/4.x architecture requires that a class driver for that type device be present (usually supplied by Microsoft, or possibly by the peripheral manufacturer). No changes to SYMC8XX.SYS are required. This driver is only supported under Windows

NT 3.5 and later versions (including NT 4.0). It does not run under earlier versions of NT.

SCSI commands are passed directly from a Windows application to the SCSI devices by using the SCSI passthrough facility (refer to the Microsoft Windows NT

3.5x/4.x documentation for details). This facility allows applications to directly control and access SCSI devices by filling in a data structure and calling in to the port driver.

The SYMC8XX.SYS driver supports Ultra SCSI protocol, providing twice the raw data transfer rate of Fast

SCSI for disk drives and Symbios Logic host adapters that support Ultra SCSI. However, Ultra SCSI requires more stringent SCSI bus cabling setups than Fast SCSI.

Symbios Logic PCI SDMS User’s Guide 8-3


Installing Your SYMC8XX.SYS Driver

Installing Your

SYMC8XX.SYS Driver

Preparing a Symbios

Driver Diskette

8

Copy the files listed below to the root directory of a clean floppy diskette, and use this Symbios Driver diskette during installation:

SYMC8XX.SYS

SYMC8XX.TAG

OEMSETUP.INF

TXTSETUP.OEM

New System

Installation

8

This procedure installs the SYMC8XX.SYS driver onto a

Windows NT system. Use this procedure when installing

NT onto an unused SCSI drive. NT automatically adds the driver to the registry and copies the driver to the appropriate directories.

1

Start the NT installation by booting from the

Microsoft Setup floppy disk.

2

Press Enter when the Welcome to Setup screen appears.

3

On the Setup Method screen, choose Custom Setup by pressing C. (If Express Setup is chosen, the installation program scans for SCSI adapters and finds the Symbios Logic PCI (53C810) driver

(NCRC810.SYS for NT 3.5x, SYMC810.SYS for

NT 4.0), which is an older version of the

SYMC8XX.SYS driver. Let the installation continue.

8




When installation completes, change the driver. To change the driver, see the “Existing System

Installation” section.)

4

Press S to skip mass storage device detection. (If

Enter is pressed, the installation program scans for

SCSI adapters and finds the Symbios Logic PCI

(53C810) driver (NCRC810.SYS for NT 3.5x,

SYMC810.SYS for NT 4.0), which is an older version of the SYMC8XX.SYS driver. Let installation continue. When the installation completes, change the driver. To change the driver, see the “Existing System

Installation” section.)

5

When a screen displays the SCSI adapters found, choose S to configure additional SCSI adapters.

6

Move the highlight bar to Other and press Enter.

7

When prompted for Manufacturer-supplied hardware support disk, insert your Symbios Driver diskette and press Enter.

8

The Symbios Logic PCI (53C8XX) Miniport driver,

Symbios Logic PCI <53C8XX>, is shown highlighted. Press Enter to proceed.

9

NT should now recognize the Miniport driver and the

SCSI hardware. Press Enter to continue.

At this point, simply follow the Microsoft Windows NT installation procedure.




Existing System

Installation

8

This procedure installs the SYMC8XX.SYS driver onto an existing Windows NT system.

NOTE:

Windows NT 4.x uses the Windows 95 user interface, resulting in minor changes to the procedure for updating SCSI drivers. Procedures for both NT 4.x and

NT 3.5x are listed.

Windows NT 4.x

1

Boot NT and log on as Administrator.

8

2

Click the Start button, move to Settings, then to

Control Panel, and click.

3

Double-click on SCSI Adapters.

4

Click the Drivers tab. If NCRSDMS.SYS,

NCRC810.SYS, NCRC8XX.SYS, or

SYMC8XX.SYS drivers are listed, select the driver(s) and choose Remove before adding the new driver.

Select OK when the Remove Driver message prompts, “Are you sure you want to remove this driver?”. Another message may display saying “The

SCSI Adapter has been marked as a boot device...”.

Click OK.

5

Click Add. A list of installed adapters is displayed.

6

Click the Have Disk button.

7

When prompted, insert your Symbios Driver diskette.

For the path to the files, leave a:\ and select OK.




8

On the Select Manufacturer Driver menu, the

Miniport driver, Symbios Logic PCI (53C8XX), is shown highlighted. If it is not highlighted, select it.

Choose OK.

At this point, the following message may occur:

“The driver(s) for this SCSI Adapter are already on the system. Do you want to use the currently installed driver(s) or install new one(s)?”

Selecting Current uses the driver already on the system, and selecting New uses the driver on the floppy disk. Unless you want to use the older version already on the system, choose New. If you chose

Current, go to step 10.

9

For the path to the OEM SCSI Adapter files, leave a:\ and select Continue.

10 A System Settings Change message displays “You must restart your computer before the new settings take effect. Do you want to restart your computer now?” Choose OK to restart and reboot NT. If you choose Cancel, remember that you must restart before the new driver is loaded.

11 Rebooting loads your new Miniport driver.

Windows NT 3.5x

1

Boot NT and log on as Administrator.

2

Open the Main window in the Program Manager.

3

Double-click on Windows NT Setup.

8




4

Choose Options, then choose Add/Remove SCSI

Adapters.... If NCRSDMS.SYS, NCRC810.SYS,

NCRC8XX.SYS, or SYMC8XX.SYS drivers are listed, select the driver(s) and choose Remove before adding the new driver. Select OK when the Setup

Message prompts, “Are you sure you want to remove the selected SCSI Adapter?”

5

Then choose Add, and select OK when the Setup

Message prompts, “Are you sure you want to add a

SCSI Adapter?”

6

On the SCSI Adapter list, go to the bottom and choose Other.

7

When prompted, insert your Symbios Driver diskette.

For the path to the files, leave a:\ and select OK.

8

On the Select OEM Option menu, the Miniport driver, Symbios Logic PCI (53C8XX), is shown highlighted. If it is not highlighted, select it. Choose

OK.

9

On the Select SCSI Adapter Option menu, choose

Install with the SYMBIOS LOGIC Inc. PCI

(53C8XX) driver highlighted.

At this point, the following message may occur:

“The driver(s) for this SCSI Adapter are already on the system. Do you want to use the currently installed driver(s) or install new one(s)?”

Selecting Current uses the driver already on the system, and selecting New uses the driver on the floppy disk. Unless you want to use the older version


Disk Mirroring



already on the system, choose New. If you chose

Current, go to step 11.

10 For the path to the OEM SCSI Adapter files, leave a:\ and select Continue.

11 On the SCSI Adapter Setup menu, choose Close.

12 Rebooting loads your new Miniport driver.

8

Note:

This section only applies to Intel x86-platforms where Symbios Logic's 4.x PCI SCSI BIOS is used.

Symbios Logic's 4.x PCI SCSI BIOS loads only one image in the memory when the system boots regardless if single or multiple host bus adapters (HBAs) are used in the system. All the disk drives on any HBAs will be recognized through the INT 13h function call. Because of this implementation, disk mirroring under NT needs to be done via the following instructions which might be different from Microsoft's documentation.

Here's how to create a NT Fault Tolerance (FT) floppy so that you can boot from the mirrored partition in case the primary partition fails.

1

Format a floppy disk under NT using either Windows

Explorer or the format option in My Computer. This allows the floppy boot block to print to the NTLDR program.

2

From the root directory of the primary partition, copy

NTLDR, NTDETECT.COM, and BOOT.INI to the formatted floppy disk which will become the FT floppy.




3

Temporarily remove the read-only attribute of the

BOOT.INI so that it can be modified and saved.

4

Edit BOOT.INI on the FT floppy and modify the following line where you want to boot the mirrored partition.

multi(0)disk(0)rdisk(x)partition(y)\<winnt_directory> where multi(0) and disk(0) should always remain same.

x = (the drive number of the mirrored partition in the

INT 13 chain - 80h).

The drive number of the mirrored partition can be found during system bootup of Symbios Logic's 4.x

PCI SCSI BIOS when the primary partition doesn't exist. It should say either BOOT (=80h), 81h, 82h, and higher. Therefore the value of x would be 0 when

BOOT, 1 when 81h, 2 when 82h, etc.

y = the partition number on the drive (starts at 1 which equals single partition on drive)

For example, let's say there are two Symbios Logic's

8xx HBAs in the system. The first HBA, HBA #0 which is the boot path, has two SCSI hard drives on

ID 0 and ID 5.

The second HBA, HBA #1, has two SCSI hard drives on ID 2 and ID 4. Assuming that SCSI bus scan starts from ID 0 and goes up, the drive number of INT 13h will look like this:

HBA #0, ID 0= BOOT (which is 80h)

HBA #0, ID 5= 81h

HBA #1, ID 2= 82h

HBA #1, ID 4= 83h


Command Line

Options



Now NT is installed on the boot drive, HBA #0 ID 0, and a mirrored partition is established on HBA #1 ID

2. If the primary partition fails, for example due to a power failure, then the drive number of INT 13h will change:

HBA #0, ID 5= BOOT (which is 80h)

HBA #1, ID 2= 81h

HBA #1, ID 4= 82h

Therefore, the following line should be used in the

BOOT.INI to boot from the mirrored partition, HBA

#1 ID 2. Note that rdisk(1) was calculated from x=81h-80h.

multi(0)disk(0)rdisk(1)partition(1)\<winnt_directory>

5

Save the BOOT.INI and restore the read-only attribute.

8

There are no command line options with the Windows

NT device driver.

Troubleshooting

8

DURING INSTALLATION, NO SCSI DEVICES ARE

FOUND.

a

Insure that the custom setup is chosen on the Setup

Method screen.

b

Insure that all devices are powered on and terminated correctly.

c

Check that no devices have duplicate SCSI IDs.

d

Make sure INT A is assigned for the PCI slot(s) where your SCSI host adapter(s) are installed.




SYSTEM CRASHES DURING INSTALLATION

WITH A MESSAGE INDICATING INACCESSIBLE

BOOT DEVICE.

a

This error is usually associated with an IRQ, DMA channel, I/O (chip) address, or BIOS address conflict.

Set the SCSI host adapter to use a different interrupt.

b

This error is sometimes caused by a virus infecting the

Master Boot Record of the boot device. Use a writeprotected DOS bootable flex containing virus scanning and cleaning software to check for any viruses on the boot device, and remove if any are found.

A DISK DRIVE IS RECOGNIZED AS SEVEN

DIFFERENT DEVICES WHEN ONLY ONE IS

PHYSICALLY CONNECTED TO THE SCSI BUS.

This error is usually caused by older SCSI devices incorrectly indicating to NT that they support multiple LUNs. Contact the device manufacturer for a firmware upgrade.

PROBLEMS WITH CERTAIN SCSI DEVICES

WHEN USING AN ULTRA SCSI ADAPTER

Some SCSI devices do not function properly when the adapter attempts to negotiate Ultra SCSI transfer rates. If a device is not operating properly, check the transfer speed setting using the PCI BIOS

Configuration Utility (press Control-C when the

Symbios Logic PCI BIOS banner is displayed during the system boot process). Devices that don't support

Ultra SCSI should be set to a maximum of 10 MB/sec for narrow (8 bits), 20 MB/sec for wide (16 bits).




PROBLEMS WITH ULTRA SCSI (FAST 20)

DEVICES USING ULTRA SCSI PROTOCOL

a

If the system is configured with a Symbios Logic host adapter that supports Ultra SCSI, and an Ultra SCSI device is on the SCSI bus, intermittent problems and possible system crashes can occur if the SCSI bus cable and terminators do not conform to the Ultra

SCSI specification.

b

Disable Ultra SCSI support for all devices via the 4.x

PCI BIOS Configuration Utility (press Control-C when the Symbios Logic PCI BIOS banner is displayed during the system boot process).

c

If the system operates properly without Ultra SCSI enabled, it is highly likely that the SCSI bus cable and terminators are not configured correctly for Ultra

SCSI. See the Symbios Logic host adapter User's

Guide for information on Ultra SCSI cabling requirements.





A

B

Glossary

Glossary

Active Termination The electrical connection required at each end of the SCSI bus, composed of active voltage regulation and a set of termination resistors. Ultra and

Ultra2 SCSI require active termination.

Address A specific location in memory, designated either numerically or by a symbolic name

API Application Programming Interface. A standard bridge (or specification) for which software is written, allowing the passing of information and instructions between the various parts of a computer system.

ASPI Advanced SCSI Programming Interface. A specification for a common structured method of supporting SCSI peripherals. It provides an interface between host adapters and SCSI device drivers.

Asynchronous Data Transfer One of the ways data is transferred over the SCSI bus. It is slower than synchronous data transfer.

Bernoulli box A high-capacity data storage device that uses a removable, non-volatile cartridge.

Binary code Software instructions reduced to ones and zeros that are readable by a computer.

BIOS Basic Input/Output System. Software that provides basic read/write capability. Usually kept as firmware

(ROM based). The system BIOS on the mainboard of a computer is used to boot and control the system. The

SCSI BIOS on your host adapter acts as an extension of the system BIOS.

Symbios Logic PCI SDMS User’s Guide Glossary -1

Glossary

C

Glossary-2

Bit A binary digit. The smallest unit of information a computer uses. The value of a bit (0 or 1) represents a two-way choice, such as on or off, true or false, and so on.

Boot disk A disk with all the necessary files to set the computer into operation.

Bootable solution A SCSI implementation that allows booting from a SCSI device. This requires a resident

ROM.

Bundled Drivers are distributed with the operating system by the OS vendor.

Bus A collection of unbroken signal lines across which information is transmitted from one part of a computer system to another. Connections to the bus are made via taps on the lines.

Bus Mastering A high-performance way to transfer data.

The host adapter controls the transfer of data directly to and from system memory without bothering the computer’s microprocessor. This is the fastest way for multitasking operating systems to transfer data.

Byte A unit of information consisting of eight bits.

CAM Common Access Method. A specification (API), developed by an industry committee, for a common structured method of supporting SCSI peripherals.

CD-ROM Compact Disk-Read Only Memory. An optical storage technology that uses compact disks to store up to

650 megabytes of data per disk.

Compile To translate source code written in a high-level language into object code.


D

Glossary

Concatenated Driver A SCSI driver with a SCSI BIOS added on to it. Sacrifices SCSI drive bootability in favor of connectivity and lower cost.

Configuration Refers to the way a computer is set up; the combined hardware components (computer, monitor, key board, and peripheral devices) that make up a computer system; or the software settings that allow the hardware components to communicate with each other.

CPU Central Processing Unit. The “brain” of the computer that performs the actual computations. The term Micro Processor Unit (MPU) is also used.

Device Driver A program that allows a microprocessor

(through the operating system) to direct the operation of a peripheral device.

Differential SCSI A hardware configuration for connecting

SCSI devices. It uses a pair of lines for each signal transfer

(as opposed to single-ended SCSI which references each

SCSI signal to a common ground.)

DMA Direct Memory Access. The ability of an I/O system to transfer data to and from a memory subsystem without CPU intervention.

DMA Bus Master A feature that allows a peripheral to control the flow of data to and from system memory by blocks, as opposed to PIO (Programmed I/O) where the flow is by byte.

Driverless Solution A SCSI implementation, supported by the SCSI BIOS alone, that provides adequate features for a limited system (hard disks only).

Symbios Logic PCI SDMS User’s Guide Glossary-3

Glossary

E

F

H

Glossary-4

EISA Extended Industry Standard Architecture. An extension of the 16-bit ISA bus standard. It allows devices to perform 32-bit data transfers.

External SCSI Device A SCSI device installed outside the computer cabinet. These devices are connected in a continuous chain using specific types of shielded cables.

Fast-20 An extension of the SCSI-3 standard that expands the bandwidth of the SCSI bus, allowing faster synchronous transfer rates (approximately double).

Fast-40 The SCSI trade association (STA) supports the use of “Ultra2 SCSI” over the term “Fast-40”. Please see

Ultra2 SCSI.

Fast SCSI A standard for SCSI data transfers. It allows a transfer rate of up to 10 MBytes/sec over an 8-bit SCSI bus and up to 20 MBytes/sec over a 16-bit SCSI bus.

File A named collection of information stored on a disk.

Formatting To prepare a disk to receive information by organizing its surface into tracks and sectors.

HAB Host Adapter Board. A circuit board that provides a bus connection to a computer system.

Hard Disk A disk made of metal and permanently sealed into a drive cartridge. A hard disk can store very large amounts of information.

HBA Host Bus Adapter. An integrated circuit that supplies a bus connector to a computer system.

Host The computer system in which a SCSI host adapter is installed. It uses the SCSI host adapter to transfer information to and from devices attached to the SCSI bus.


I

K

L

Glossary

Host Adapter A circuit board or integrated circuit that provides a SCSI bus connection to the computer system.

Internal SCSI Device A SCSI device installed inside the computer cabinet. Internal SCSI devices are connected in a continuous chain using an unshielded ribbon cable.

IRQ Interrupt Request Channel. A path through which a device can get the immediate attention of the computer’s

CPU. The PCI bus assigns an IRQ path for each SCSI host adapter.

ISA Industry Standard Architecture. A type of computer bus used in most PC’s. It allows devices to send and receive data 16-bits at a time.

KByte Kilobyte. A measure of computer storage equal to

1024 bytes.

Link To produce an executable program from compiled modules (programs, routines, libraries) by merging the object code and resolving interconnecting references.

Local Bus A way to connect peripherals directly to computer memory. It bypasses the slower ISA and EISA busses. PCI is a local bus standard.

Logical Unit A subdivision, either logical or physical, of a

SCSI device (actually the place for the device on the SCSI bus). Most devices have only one logical unit, but up to eight are allowed for each of the eight possible devices on a SCSI bus.

LUN Logical Unit Number. An identifier, zero to seven, for a logical unit.

LVDlink Low Voltage Differential Link allows greater

Ultra2 SCSI device connectability and longer SCSI


Glossary

M

N

cables. LVDlink lowers the amplitude of noise reflections and allows higher transmission frequencies.

Main board A large circuit board that holds RAM, ROM, the microprocessor, custom integrated circuits, and other components that make a computer work. It also has expansion slots for host adapters and other expansion boards.

Main Memory The part of a computer’s memory which is directly accessible by the CPU (usually synonymous with

RAM).

Motherboard See Mainboard. In some countries, the term Motherboard is not appropriate.

Multi-tasking The executing of more than one command at the same time. This allows programs to operate in parallel.

Multi-threading The simultaneous accessing of data by more than one SCSI device. This increases the data transfer rate.

Network A collection of devices, such as computers and printers, that are connected together. A network is a tool for communication that allows users to store and retrieve information, share printers, and exchange information.

NVRAM Non-Volatile Random Access Memory. Actually an EEPROM (Electronically Erasable Read Only

Memory chip) used to store configuration information.

Glossary-6 Symbios Logic PCI SDMS User’s Guide

O

P

Glossary

Object code Software instructions that are compiled as an intermediate step between source code and binary code.

Operating System A program that organizes the internal activities of the computer and its peripheral devices. An operating system performs basic tasks such as moving data to and from devices, and managing information in memory. It also provides the user interface.

Parity Checking A way to verify the accuracy of data transmitted over the SCSI bus. One bit in the transfer is used to make the sum of all the 1 bits either odd or even

(for odd or even parity). If the sum is not correct, an error message appears.

Partition A logical portion of space on a hard disk designated by a drive letter.

Passive Termination The electrical connection required at each end of the SCSI bus, composed of a set of resistors.

It improves the integrity of bus signals.

PCI Peripheral Component Interconnect. A local bus specification that allows connection of peripherals directly to computer memory. It bypasses the slower ISA and

EISA busses.

Peripheral Device A piece of hardware (such as a video monitor, disk drive, printer, or CD-ROM) used with a computer and under the computer’s control. SCSI peripherals are controlled through a SCSI host adapter.

PIO Programmed Input/Output. A way the CPU can transfer data to and from memory via the computer’s I/O ports. PIO is faster than DMA, but requires CPU time.

Port Address Also Port Number. The address through which commands are sent to a host adapter. This address is assigned by the PCI bus.


Glossary

Q

R

S

Glossary-8

Port Number See Port Address.

POST Power On Self Test. A set of routines stored in

ROM that test various system components before booting can proceed.

Processor A computer hardware component that performs computations directed by software commands.

Queue Tags A way to keep track of multiple commands that allows for increased throughput on the SCSI bus.

RAM Random Access Memory. The computer’s primary working memory in which program instructions and data are stored and are accessible to the CPU. Information can be written to and read from RAM. The contents of RAM are lost when the computer is turned off.

Removable media A computer data storage device in which the magnetic disk or tape is enclosed in a removable cassette or cartridge.

RISC Core Symbios Logic SCSI chips contain a RISC

(Reduced Instruction Set Computer) processor, programmed through microcode scripts.

ROM Read Only Memory. Memory from which information can be read but not changed.The contents of

ROM are not erased when the computer is turned off.

SCAM SCSI Configured AutoMatically. A method to automatically allocate SCSI IDs via software when SCAM compliant SCSI devices are attached.

Scatter/Gather A device driver feature that lets the host adapter modify a transfer data pointer so that a single host adapter transfer can access many segments of memory.

This minimizes interrupts and transfer overhead.


Glossary

SCSI Small Computer System Interface. A specification for a high performance peripheral bus and command set.

The original standard is referred to as SCSI-1.

SCSI-2 The current SCSI specification which adds features to the original SCSI-1 standard.

SCSI Bus A host adapter and one or more SCSI peripherals connected by cables in a linear chain configuration. The host adapter may exist anywhere on the chain, allowing connection of both internal and external SCSI devices. A system may have more than one

SCSI bus by using multiple host adapters.

SCSI Device Any device that conforms to the SCSI standard and is attached to the SCSI bus by a SCSI cable.

This includes SCSI host adapters and SCSI peripherals.

SCSI ID A way to uniquely identify each SCSI device on the SCSI bus. Each SCSI bus has eight available SCSI

IDs numbered 0 through 7 (or 0 through 15 for Wide

SCSI). The host adapter usually gets ID 7 giving it priority to control the bus.

SDMS SCSI Device Management System. A Symbios

Logic software product that manages SCSI system I/O.

Single Ended SCSI A hardware specification for connecting SCSI devices. It references each SCSI signal to a common ground. This is the most common method

(as opposed to differential SCSI which uses a separate ground for each signal).

Software The entire set of programs, procedures, and related documentation associated with a computer system.

Source code Software instructions written as text in a high level programming language. It is readable by humans who know the language.


Glossary

V

W

T

U

Glossary-10

Synchronous Data Transfer One of the ways data is transferred over the SCSI bus. Transfers are clocked with fixed-frequency pulses. It is faster than asynchronous data transfer, but cannot be used for certain kinds of transfers, so some negotiation is required.

System BIOS Controls the low level POST (Power On

Self Test), and basic operation of the CPU and computer system.

Tape drive A storage device designed to back up data from another storage device onto magnetic tape at a high rate of speed. Data is stored sequentially (no random access).

Ultra SCSI A standard for SCSI data transfers. It allows a transfer rate of up to 20 MB/sec over a 8-bit SCSI bus and up to 40 MB/sec over a 16-bit SCSI bus. STA (SCSI

Trade Association) supports using the term “Ultra2

SCSI” over the term “Fast-20”.

Ultra2 SCSI A standard for SCSI data transfers. It allows a transfer rate of up to 80 MB/sec over a 16-bit SCSI bus.

STA (SCSI Trade Association) supports using the term

“Ultra2 SCSI” over the term “Fast-40”.

Virtual Memory Space on a hard disk that can be used as if it were RAM.

Wide SCSI A SCSI-2 feature allowing 16 or 32-bit transfers on the SCSI bus. This dramatically increases the transfer rate over the standard 8-bit SCSI bus.

Word A two byte (or 16-bit) unit of information.


Glossary

WORM Write Once Read Many. An optical storage device, like CD-ROM, used to permanently store data.


Glossary

Glossary-12 Symbios Logic PCI SDMS User’s Guide

J13972I

0297-15MH

©1997 Symbios Logic

Printed in USA

PCI SCSI Device Management System SDMS 4.0

User’s Guide

PCI SCSI Device Management System SDMS 4.0

Device Drivers for Windows

NT

Introduction for Windows NT

3.5x/4.x

Features

Description

Installing Your

SYMC8XX.SYS Driver

Preparing a Symbios

Driver Diskette

New System

Installation

Existing System

Installation

Windows NT 4.x

Windows NT 3.5x

Disk Mirroring

Command Line

Options

Troubleshooting

A

B

Glossary

C

D

E

F

H

I

K

L

M

N

O

P

Q

R

S

V

W

T

U

PCI SCSI Device Management System SDMS 4.0

User’s Guide

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PCI Storage Device Management System SDMS

Asus

Dual Socket 370 Motherboard

Asus

CUR-DLSR

Advantech

PCM-9570/S

Advantech

MIC-3351

LSI

SYM20810 PCI to SCSI Host Adapter

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